[1] Univ Bundeswehr Munchen, Inst Mat Sci, Dept Aerosp Engn, Werner Heisenberg Weg 39, D-85577 Neubiberg, Germany
[2] Bundeswehr Res Inst Mat Fuels & Lubricants WIWeB, Surface Anal & Technol, Erding, Germany
[3] Bundeswehr Res Inst Mat Fuels & Lubricants WIWeB, Mat & Construct Methods, Erding, Germany